Hey OpenStack Charmers, We have a Newton deployment on MAAS with 3 controller machines running all the usual OpenStack controller services in 3x HA with the hacluster charm in LXD containers. Now we'd like migrate some of those OpenStack services to 3 larger controller machines. Downtime of the services during the migration is not an issue.
My current plan is test something like this: * Add the new controller machines to the model * Increase the cluster_count from 3 to 6 on the hacluster charm of the services in question * Add units to the service to LXD containers on the new controller machine * Wait for things to deploy and cluster * Decrease the cluster_count from 6 to 3 * Remove units on the old controller Questions: 1. Is there a preferred way to migrate OpenStack services deployed by charms? 2. Does the plan above look somewhat sane? 3. If yes to the above, does the order of changing the cluster_count and adding/removing units matter? I've seen this bug for example: https://bugs. launchpad.net/charm-hacluster/+bug/1424048 4. Anything to keep in mind for scaling up and down the rabbitmq and percona clusters? Cheers -- Sandor Zeestraten
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